32[2703]______ means the curve on the earth's surface which cuts all the meridians at the same angle．

A. Great Circle

B. Position Line

C. Rhumb line罗盘方位；恒向线

D. True Bearing

33[1749]Which word indicates color variation in the characteristics of a light?

A. Opposing

B. Changing

C. Reversing

D. Alternating---交替的，交流的，互光的，互光（指周期性变色的航标灯）

34[2674]A SEAMARK，I.E. A BUOY，INDICATING THE NORTH，EAST，SOUTH OR WEST FROM A FIXED POINT，E.G. A WRECK is ______.

A. Entrance buoy

B. New buoy

C. Port buoy

D. Cardinal buoy

35[821] Mean high water is the average height of _____

A. the higher high waters B. the lower high waters

C. the lower of the two daily tides D. all high waters

36[149]The meaning of ebb tide is that ______.

A. tide is falling from high water to low water

B. tide is rising from low water to high water